Mazda CX-30 2020 Owner's Manual page 44

Essential Safety Equipment
Seat Belt Systems
Some smoke (non-toxic gas) will be

released when the air bags and
pretensioners deploy. This does not
indicate a fire. This gas normally has
no effect on occupants, however,
those with sensitive skin may
experience light skin irritation. If
residue from the deployment of the
air bags or the pretensioner system
gets on the skin or in the eyes, wash
it off as soon as possible.
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